The San Juan River is a significant tributary of the Colorado River in the southwestern United States, about 383 miles long.The river drains an area of about 24,600 square miles in southwestern Colorado, northwestern New Mexico, southeastern Utah, and a small part of northeastern Arizona. The average flow of the San Juan River at Bluff is about 2,200 cubic feet per second and the highest discharge ever measured was about 70,000 cubic feet per second on September 10, 1927.
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